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Re: Loop optimizer issues
- From: David Edelsohn <dje at watson dot ibm dot com>
- To: Jan Hubicka <jh at suse dot cz>
- Cc: "S. Bosscher" <S dot Bosscher at student dot tudelft dot nl>, "'Zdenek Dvorak '" <rakdver at atrey dot karlin dot mff dot cuni dot cz>, "'Richard Henderson '" <rth at redhat dot com>, "'Geoff Keating '" <geoffk at geoffk dot org>, "'Diego Novillo '" <dnovillo at redhat dot com>, "'Jason Merrill '" <jason at redhat dot com>, "'Daniel Berlin '" <dberlin at dberlin dot org>, "'pop at gauvain dot u-strasbg dot fr '" <pop at gauvain dot u-strasbg dot fr>, "'gcc at gcc dot gnu dot org '" <gcc at gcc dot gnu dot org>
- Date: Wed, 02 Jul 2003 18:43:24 -0400
- Subject: Re: Loop optimizer issues
>>>>> Jan Hubicka writes:
Jan> Zdenek is speaking about the invariant motion. Clearly there are many
Jan> cases where RTL expansion will bring oppurtunities for invariant motion,
Jan> so these needs to be re-done on the RTL.
Jan> Concerning libcalls, they should not exist in post-tree-SSA world as
Jan> they are just papering over the problem that such complex things should
Jan> have been moved earlier.
How about starting with a Tree-SSA loop optimization
infrastructure and then back-filling RTL loop optimizations where they are
profitable instead of guessing?
David